Gregory S. Neilley, MD
Internal Medicine Physician · Peterborough, NH
Gregory S. Neilley, MD is an internal medicine physician with a practice address in Peterborough, New Hampshire, and NPI 1336117852, issued on Mar 9, 2006. Check the license (New Hampshire 8060, as entered in NPPES) on the New Hampshire Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Gregory S. Neilley
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 8060 NH
Self-reported in NPPES; status is on the state search - Practice location
- 454 Old Street RD, Peterborough, NH 03458
- Phone
- (603) 924-4680
- Enumerated
- Mar 9, 2006
- Record last updated
- Nov 9, 2015 (not updated in 11 years: call before relying on the address or phone)
- Fax
- (603) 924-4977
- Medicaid ID
- 30002991 NH
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 673 in New Hampshire → Look up another NPI →
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A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Gregory S. Neilley in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNew Hampshire Board of Medicine
Search for license 8060Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average internal medicine physician in 2024
29 Medicare Part D claims, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Gregory S. Neilley among 673 internal medicine physician records in New Hampshire
Gregory S. Neilley, MD is one of 673 internal medicine physician records with a practice address in New Hampshire. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 8% of them.
- NPI issued2006 · 8% of these records are older, 50% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 66% of these records are
- Record last updated2015 · 53% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a New Hampshire practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
5 internal medicine physician records list a practice address in Peterborough
They are 5 of the 281 NPPES records with a practice address in Peterborough, and 673 internal medicine physician records in New Hampshire.
All 673 in New Hampshire → Every provider in Peterborough → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Kedaari Anant, MDPeterborough, NH 034581871016832
- Daniel Perli, MD, MBAPeterborough, NH 034581619288057
- Lucas Shippee, DOPeterborough, NH 034581053339887
- Dmitry Tarasevich, M.D.Peterborough, NH 034581215119532
- Peter Cohen, DOJaffrey, NH 034521982771671
- Brock Billadeau, D.O.Keene, NH 034311386164069
- Vinaya Jaikumar, MBBSKeene, NH 034311790302966
- Majed Najjar, M.D.Keene, NH 034311194107987
Common questions
What is Gregory S. Neilley, MD's NPI number?
Gregory S. Neilley, MD's National Provider Identifier (NPI) is 1336117852, issued on Mar 9, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gregory S. Neilley, MD located?
The NPPES record lists a practice address at 454 Old Street RD, Peterborough, NH, 03458. Phone: (603) 924-4680. Providers update this record themselves, so call before visiting.
How can I verify Gregory S. Neilley, MD's license?
NPPES lists New Hampshire license number 8060, as entered by the provider. Search the New Hampshire Board of Medicine at https://www.oplc.nh.gov/board-medicine. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Gregory S. Neilley, MD prescribe under Medicare Part D?
In 2024, Gregory S. Neilley, MD had 29 Medicare Part D claims; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.